Can't seem to get past "No compiler matching" error

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1

Trying to run make build-deps on Ubuntu 20.04.4 and getting this error
[ERROR] No compiler matching ocaml-base-compiler.4.12.1' found, use opam switch list-available’ to see what is available, or use `–packages’ to select packages explicitly.
make: *** [Makefile:250: build-deps] Error 5

I did a opam switch create. This is current setup after doing that

$ opam switch list

switch compiler description

→ current ocaml-base-compiler.4.12.1 current
default ocaml.4.13.1 default

and the version of ocaml
$ ocaml --version
The OCaml toplevel, version 4.12.1

No idea if the naming of the switch is part of the problem. Any ideas what’s causing the error?

2

that’s how I bootstrap form2xml/bootstrap.txt at master - form2xml - Codeberg.org

How did you? And yes, there may be other ways.

3

In which context are you trying to run make build-deps?

4

Trying to build a blockchain validator (Tezos) Not sure if that answers your question about context. Let me know any further details you need. I had also run this last night

opam install ocaml-base-compiler.4.12.1

5

If you want to install a compiler, it is better to create a new switch with

opam switch create 4.12.1

That doesn’t answer the question of which Makefile you were trying to execute with make build-deps. Were you trying to build one of the opam tezos package, or one of the github tezos repository? What is the content of the Makefile?

From your configuration, it looks like the 4.12.1 compiler is already installed.

6

Appears to be the github tezos repo.

Here's the entry from the Makefile
.PHONY: build-deps
build-deps:
        @./scripts/install_build_deps.sh

And here are the opam calls in the build deps script

echo "about to run opam repository" $opam_repository

opam repository set-url tezos --dont-select "$opam_repository" || \
    opam repository add tezos --dont-select "$opam_repository" > /dev/null 2>&1

echo "about to run opam update"
opam update --repositories --development
echo "done running update"

Appears to be failing with the “opam update” Also, here’s the echo before the “opam repository” run

about to run opam repository Tezos / opam-repository · GitLab

7

Decided to start from scratch, removed the local tezos repo, uninstalled opam. Installed latest 2.1.2 version of ocaml/opam. Cloned again the tezos repo

Still get the same error. Below are the steps at installing (creating) and setting the switch, and the error

:~/tezos$ opam switch install ocaml.4.12.1
opam: install was removed in version 2.1 of the opam CLI, but version 2.1 has been requested. Use create instead or set OPAMCLI environment variable to 2.0.
:~/tezos$ opam switch create ocaml.4.12.1

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><><><>
Switch invariant: ["ocaml" {= "4.12.1"}]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
∗ installed ocaml-options-vanilla.1
⬇ retrieved ocaml-base-compiler.4.12.1  (cached)
∗ installed ocaml-base-compiler.4.12.1
∗ installed ocaml-config.2
∗ installed ocaml.4.12.1
Done.

:~/tezos$ opam switch list
#  switch        compiler                    description
   current       ocaml-base-compiler.4.12.1  current
   default       ocaml.4.13.1                default
→  ocaml.4.12.1  ocaml.4.12.1                ocaml.4.12.1
:~/tezos$ opam switch set current
:~/tezos$ opam switch list
#  switch        compiler                    description
→  current       ocaml-base-compiler.4.12.1  current
   default       ocaml.4.13.1                default
   ocaml.4.12.1  ocaml.4.12.1                ocaml.4.12.1
:~/tezos$ make build-deps
[ERROR] Could not update repository "tezos": "/usr/bin/cp -PRp /home/*****/.opam/repo/tezos/.git /home/*******/.opam/repo/tezos.new" exited with code 1

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] no changes from https://opam.ocaml.org
[ERROR] No compiler matching `ocaml-base-compiler.4.12.1' found, use `opam switch list-available' to see what is available, or use `--packages' to select packages explicitly.
make: *** [Makefile:250: build-deps] Error 5
8

I suppose you ask the authors of the ~/tezos/Makefile what calls their scripts synthesize and what runtime dependencies they have. Did you?

1 Like
9

Yeah since this is for setup of a specific project I feel it’s appropriate to file a ticket and get support from that project. Our forum here is of course happy to discuss general OCaml setup issues but this one seems to be very specific.

10

I posted the issue at the tezos-baking Slack. The answer I received basically directed me to a different approach to setting up a baker node without having to do a build. However, I did manage to build the node anyway by following the steps at How to get Tezos — Tezos (master branch, 2022/03/27 13:34) documentation. I did get an error with the ‘opam install depext’ step based on that site, but I was able to ignore it. The error I ignored: [ERROR] depext unmet availability conditions, e.g. 'opam-version >= “2.0.0~beta5” & opam-version < “2.1"”

Thanks, all, for the feedback!

1 Like